[. . . ] 2 IN CASE OF A PROLONGED SHUTDOWN OF THE BOILER : About one month : Carefully sweep out the boiler and the stack. [. . . ] WARRANTY You have just purchased a DE DIETRICH appliance and we thank you for the trust you have placed in our products. Please note that your appliance will provide good service for a longer period of time if it is regularly checked and maintained. Your fitter and the DE DIETRICH customer support network are at your disposal at all times. Warranty terms Starting from the purchase date shown on the original fitter's invoice, your appliance has a contractual guarantee against any manufacturing defect. The manufacturer is not liable for any improper use of the appliance or failure to maintain or install the unit correctly (the user shall take care to ensure that the system is installed by a qualified fitter). In particular, the manufacturer shall not be held responsible for any damage, loss or injury caused by installations which do not comply with the following: - applicable local laws and regulations; - specific requirements relating to the installation, such as national and/or local regulations; - the manufacturer's instructions, in particular those relating to the regular maintenance of the unit; - the rules of the profession. [. . . ] All the specifications stated in this document are therefore subject to change without notice. [. . . ]